MU-MIMO Frame Recovery via Group Control Information
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Solution Overview
Problem
In wireless communication systems using MU-MIMO technology, there is a challenge in efficiently recovering frames that fail to be transmitted, particularly control frames, which increases overhead and degrades throughput due to the need for one-to-one correspondence with multiple communication paths.
Innovation Solution
A method is introduced where group control information, including a group sequence number and bitmap information, is used to designate wireless stations as recipients, allowing for the recovery of failed response frames by retransmitting request frames to specific stations after a timeout, enabling efficient frame recovery and reduced overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-to-one correspondence with multiple communication paths is used for frame recovery, then frame transmission reliability is improved, but overhead increases and throughput degrades
Solution Approach 1:
The patent segments the communication paths by introducing group identifiers that categorize multiple STAs into different groups. This segmentation allows the system to manage frame recovery on a group basis rather than requiring individual one-to-one correspondence for each communication path, thereby reducing overhead while maintaining reliability through targeted group-specific recovery mechanisms.
Solution Approach 2:
The patent implements a universal group identifier that can be applied across multiple communication paths and frame types. This universal grouping mechanism allows a single recovery protocol to handle multiple STAs simultaneously, eliminating the need for separate recovery procedures for each individual path and reducing overall system complexity and overhead.
2Reliability
If one-to-one correspondence with multiple communication paths is used for frame recovery, then frame transmission reliability is improved, but throughput degrades
Solution Approach 1:
The patent merges multiple communication paths by grouping STAs with the same group identifier into a single manageable unit. This merging allows the system to transmit and recover frames for multiple STAs simultaneously through a unified protocol, improving throughput by eliminating redundant individual path handling while maintaining reliability through the group-based recovery mechanism.
Solution Approach 2:
The universal group identifier enables a single recovery protocol to serve multiple communication paths and frame types simultaneously. This multi-functional approach allows the system to handle frame recovery for numerous STAs through one standardized mechanism, thereby improving overall system throughput without sacrificing the reliability needed for individual frame delivery.
3Reliability
If control frames are transmitted to all STAs, then frame delivery completeness is improved, but overhead increases
Solution Approach 1:
The patent applies local quality by transmitting control frames with group identifiers targeted to specific groups of STAs rather than broadcasting to all STAs universally. This localized approach ensures that only relevant STAs within the specified group receive and process the control frames, maintaining delivery completeness for the intended recipients while significantly reducing overhead by excluding unrelated STAs from the transmission.
Solution Approach 2:
The patent segments the STA population into distinct groups using group identifiers, allowing control frames to be selectively transmitted to specific segments rather than the entire network. This segmentation enables precise targeting of control frame delivery, ensuring completeness within each group while reducing overall overhead by avoiding unnecessary transmissions to STAs outside the target group.
Data Source
AI summary
A method and apparatus of transmitting in a wireless communication system is provided. A transmitter generates a group management frame including a group information and position information and a data frame including a group control information having a group identifier for each of a plurality of groups. The group information indicates whether the receiver is a member of each of the plurality of groups. The position information indicates a position of at least one stream corresponding to at least one group of which the receiver is a member.